Stratigraphic templates for ice core records of the past 1.5 Myr
<jats:p>Abstract. The international ice core community has a target to obtain continuous ice cores stretching back as far as 1.5 Myr. This would provide vital data (including a CO2 profile) allowing us to assess ideas about the cause of the Mid-Pleistocene Transition (MPT). The European Beyond...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/339294 2024-01-14T10:02:08+01:00 Stratigraphic templates for ice core records of the past 1.5 Myr Wolff, EW Fischer, H Van Ommen, T Hodell, DA 2022-07-18T17:10:36Z application/pdf https://www.repository.cam.ac.uk/handle/1810/339294 https://doi.org/10.17863/CAM.86702 eng eng Copernicus GmbH Department of Earth Sciences http://dx.doi.org/10.5194/cp-18-1563-2022 Climate of the Past https://www.repository.cam.ac.uk/handle/1810/339294 doi:10.17863/CAM.86702 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3703 Geochemistry 3705 Geology 14 Life Below Water Article 2022 ftunivcam https://doi.org/10.17863/CAM.86702 2023-12-21T23:28:18Z <jats:p>Abstract. The international ice core community has a target to obtain continuous ice cores stretching back as far as 1.5 Myr. This would provide vital data (including a CO2 profile) allowing us to assess ideas about the cause of the Mid-Pleistocene Transition (MPT). The European Beyond EPICA project and the Australian Million Year Ice Core project each plan to drill such a core in the region known as Little Dome C. Dating the cores will be challenging, and one approach will be to match some of the records obtained with existing marine sediment datasets, informed by similarities in the existing 800 kyr period. Water isotopes in Antarctica have been shown to closely mirror deepwater temperature, estimated from Mg/Ca ratios of benthic foraminifera, in a marine core on the Chatham Rise near to New Zealand. The dust record in ice cores resembles very closely a South Atlantic marine record of iron accumulation rate. By assuming these relationships continue beyond 800 ka, our ice core record could be synchronised to dated marine sediments. This could be supplemented, and allow synchronisation at higher resolution, by the identification of rapid millennial-scale events that are observed both in Antarctic methane records and in emerging records of planktic oxygen isotopes and alkenone sea surface temperature (SST) from the Portuguese Margin. Although published data remain quite sparse, it should also be possible to match 10Be from ice cores to records of geomagnetic palaeo-intensity and authigenic 10Be/9Be in marine sediments. However, there are a number of issues that have to be resolved before the ice core 10Be record can be used. The approach of matching records to a template will be most successful if the new core is in stratigraphic order but should also provide constraints on disordered records if used in combination with absolute radiogenic ages. </jats:p> Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Apollo - University of Cambridge Repository Antarctic New Zealand |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3703 Geochemistry 3705 Geology 14 Life Below Water |
spellingShingle |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3703 Geochemistry 3705 Geology 14 Life Below Water Wolff, EW Fischer, H Van Ommen, T Hodell, DA Stratigraphic templates for ice core records of the past 1.5 Myr |
topic_facet |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3703 Geochemistry 3705 Geology 14 Life Below Water |
description |
<jats:p>Abstract. The international ice core community has a target to obtain continuous ice cores stretching back as far as 1.5 Myr. This would provide vital data (including a CO2 profile) allowing us to assess ideas about the cause of the Mid-Pleistocene Transition (MPT). The European Beyond EPICA project and the Australian Million Year Ice Core project each plan to drill such a core in the region known as Little Dome C. Dating the cores will be challenging, and one approach will be to match some of the records obtained with existing marine sediment datasets, informed by similarities in the existing 800 kyr period. Water isotopes in Antarctica have been shown to closely mirror deepwater temperature, estimated from Mg/Ca ratios of benthic foraminifera, in a marine core on the Chatham Rise near to New Zealand. The dust record in ice cores resembles very closely a South Atlantic marine record of iron accumulation rate. By assuming these relationships continue beyond 800 ka, our ice core record could be synchronised to dated marine sediments. This could be supplemented, and allow synchronisation at higher resolution, by the identification of rapid millennial-scale events that are observed both in Antarctic methane records and in emerging records of planktic oxygen isotopes and alkenone sea surface temperature (SST) from the Portuguese Margin. Although published data remain quite sparse, it should also be possible to match 10Be from ice cores to records of geomagnetic palaeo-intensity and authigenic 10Be/9Be in marine sediments. However, there are a number of issues that have to be resolved before the ice core 10Be record can be used. The approach of matching records to a template will be most successful if the new core is in stratigraphic order but should also provide constraints on disordered records if used in combination with absolute radiogenic ages. </jats:p> |
format |
Article in Journal/Newspaper |
author |
Wolff, EW Fischer, H Van Ommen, T Hodell, DA |
author_facet |
Wolff, EW Fischer, H Van Ommen, T Hodell, DA |
author_sort |
Wolff, EW |
title |
Stratigraphic templates for ice core records of the past 1.5 Myr |
title_short |
Stratigraphic templates for ice core records of the past 1.5 Myr |
title_full |
Stratigraphic templates for ice core records of the past 1.5 Myr |
title_fullStr |
Stratigraphic templates for ice core records of the past 1.5 Myr |
title_full_unstemmed |
Stratigraphic templates for ice core records of the past 1.5 Myr |
title_sort |
stratigraphic templates for ice core records of the past 1.5 myr |
publisher |
Copernicus GmbH |
publishDate |
2022 |
url |
https://www.repository.cam.ac.uk/handle/1810/339294 https://doi.org/10.17863/CAM.86702 |
geographic |
Antarctic New Zealand |
geographic_facet |
Antarctic New Zealand |
genre |
Antarc* Antarctic Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctic Antarctica EPICA ice core |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/339294 doi:10.17863/CAM.86702 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.17863/CAM.86702 |
_version_ |
1788056981701918720 |